DOI: 10.1038/NGEO2430
论文题名: Sudden spreading of corrosive bottom water during the Palaeocene-Eocene Thermal Maximum
作者: Alexander K. ; Meissner K.J. ; Bralower T.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 6 起始页码: 458
结束页码: 461
语种: 英语
Scopus关键词: acidification
; atmosphere-ocean system
; bottom water
; carbon cycle
; climate modeling
; deep water
; dissolution
; Eocene
; global climate
; Paleocene
; Paleocene-Eocene boundary
; spatial variation
; temperature profile
; thermal convection
; water column
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (South)
; Caribbean Sea
; Pacific Ocean
; Southern Ocean
英文摘要: The Palaeocene-Eocene Thermal Maximum, approximately 55 million years ago, was a period of rapid warming linked to a massive release of carbon to the ocean-atmosphere system. Thiswarming eventwas alsomarked by widespread dissolution of carbonates at the sea floor2. The acidification of deepwaters was generally more extensive and severe in the Atlantic and Caribbean, with more modest changes in the Southern and Pacific oceans3,5. Here we use the UVic ESCM global climate model to show that corrosive deep water spreading from the North Atlantic can explain the spatial variations in carbonate dissolution during the Palaeocene-Eocene Thermal Maximum. In our simulations, highly corrosive waters accumulate in the deep North Atlantic at the onset of the event. Several thousand years after an imposed atmospheric carbon release, warming of the deep ocean destabilizes the North Atlantic water column and triggers deep-water formation. This deep convection causes the corrosive bottom water to spill over an equatorial sill into the South Atlantic. The bottom water then spreads throughthe SouthernandPacific oceans, progressively gaining alkalinity. We conclude that the pattern of sediment dissolution simulated along the path taken by the corrosive water is consistent with most dissolution estimates from the sediment record. © 2015 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106174
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Climate Change Research Centre, ARC Centre of Excellence for Climate System Science, Level 4 Mathews Building, University of New SouthWales, Sydney, NSW, Australia; School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada; Department of Geosciences, Pennsylvania State University, 503 Deike Building, University Park, PA, United States
Recommended Citation:
Alexander K.,Meissner K.J.,Bralower T.J.. Sudden spreading of corrosive bottom water during the Palaeocene-Eocene Thermal Maximum[J]. Nature Geoscience,2015-01-01,8(6)